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Method for treating chitin waste water

A treatment method, chitin technology, applied in water/sewage multi-stage treatment, water/sludge/sewage treatment, dehydration/drying/thickened sludge treatment, etc. Failure to meet the national first-level discharge standards and other issues, to achieve the effect of improving nitrification and denitrification efficiency, reducing treatment costs, and improving removal rate

Inactive Publication Date: 2012-08-15
SHANGHAI WENDING WATER TREATMENT ENG
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] Chinese patent (CN1119298C) discloses a chitin wastewater treatment method, the high-concentration acid wastewater and alkaline wastewater in the production of chitin do not enter the subsequent biochemical treatment; only the washing wastewater enters the coagulation sedimentation + A / O treatment process, washing Wastewater effluent can meet the national third-level discharge standard, but fails to meet the national first-level discharge standard
[0009] Chinese patents (CN101215066) all disclose the treatment method of acidic wastewater and alkaline wastewater in chitin with "isoelectric point precipitation + flocculation precipitation + A / O biochemistry", but the treated effluent can only reach the national third-level discharge standard; no mention is made And the treatment process of large flow washing wastewater in chitin production

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  • Method for treating chitin waste water
  • Method for treating chitin waste water

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] use figure 1 The process treats the wastewater generated during the production of chitin, of which:

[0052] COD of alkaline boiling water, pickling wastewater and production washing wastewater Cr Respectively 92500mg / L, 37200mg / L, 3510mg / L, ammonia nitrogen respectively 3800mg / L, 2300mg / L, 170mg / L;

[0053] Soda boiled water: washing wastewater = 1:1, volume ratio;

[0054] (1) Send alkali boiled water and pickling waste water into primary coagulation tank 1, add sodium hydroxide to adjust the pH of waste water to 8.5, add coagulant polyferric sulfate 520mg / L, anionic polyacrylamide (molecular weight 18 million ) 2.0mg / l., the coagulation reaction time is 15 minutes, and the coagulation settlement time is 3 hours;

[0055] (2) Send the effluent and washing waste water of the primary coagulation tank 1 into the regulating tank 2;

[0056] (Alkali boiled water + pickling water): washing wastewater = 1: 80, volume ratio;

[0057] (3) Send the effluent of the adjustme...

Embodiment 2

[0067] use figure 1 The process treats the wastewater generated during the production of chitin, of which:

[0068] Treatment of alkaline boiled water, pickling wastewater and washing wastewater COD Cr Respectively 64300mg / L, 27400mg / L, 2640mg / L, ammonia nitrogen respectively 4100mg / L, 1290mg / L, 136mg / L;

[0069] Soda boiled water: pickling waste water = 1: 2, volume ratio;

[0070] (1) Send alkali boiled water and pickling waste water into primary coagulation tank 1, add sodium hydroxide to adjust the pH of waste water to be 8.5, add coagulant polyaluminum ferric sulfate 430mg / L, anionic polyacrylamide (molecular weight 1800 10,000) 3.0mg / l, the coagulation reaction time is 15 minutes, the coagulation settlement time is 2 hours, and the sludge enters the sludge thickening tank 8 for sludge dehydration and reduction.

[0071] (2) Send the effluent and washing waste water of the primary coagulation tank 1 into the regulating tank 2;

[0072] (Alkali boiled water + pickling ...

Embodiment 3

[0083] Adopt the method identical with embodiment 1, wherein, the bacterial classification that step (4) adopts is Orthomonas;

[0084] Using GB11914-89 and other national standard detection methods, the results are as follows:

[0085] The effluent pH is 7.1, CODcr 80mg / l, total phosphorus 0.25mg / L, ammonia nitrogen 3.1mg / L, SS14mg / L.

[0086] The effluent is better than the Class I discharge standard of the comprehensive sewage discharge standard of the People's Republic of China "GB8978-1996".

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Abstract

The invention provides a method for treating chitin waste water, wherein the method comprises the following steps of: (1) conveying soda boiling water and pickling waste water into a first-level coagulation tank for first-level coagulation sedimentation; (2) conveying yielding water of the step (1) and washing waste water into a regulating tank; (3) conveying the yielding water in the regulating tank into a second-level coagulation air floatation tank; (4) conveying the yielding water of the step (3) into an up-flow anaerobic sludge blanket; (5) conveying the yielding water of the step (4) into a hydrolysis acidification tank, and carrying out hydrolysis acidification; (6) conveying the yielding water in the hydrolysis acidification tank into a contact oxidization tank; (7) carrying out partial reflux of the yielding water in the contact oxidization tank to the hydrolysis acidification tank; and (8) conveying the residual yielding water in the contact oxidization tank into a three-level coagulation sedimentation tank for coagulation sedimentation, and discharging the obtained clean water. According to the invention, the waster water in the production of chitin is treated comprehensively, the treating expense is lowered, and the yielding water is superior to the first level discharge standard stipulated by Integrated Waste Water Discharge Standard of People's Republic of China (GB8978-1996).

Description

technical field [0001] The invention relates to a treatment method for waste water with poor biodegradability, high salinity, high ammonia nitrogen and high organic matter concentration, in particular to a treatment method for chitin waste water. Background technique [0002] Chitin (chitin, chitin) uses shrimp and crab shells as basic raw materials, removes protein by dilute alkali, and removes calcium with hydrochloric acid to obtain a crude product. After further concentrated alkali treatment, it can be made into chitin containing amino groups ( chitosan or glucosamine). The production of 1 ton of chitin will produce at least about 50 tons of waste water. The waste water mainly comes from: (1) alkali boiled water generated when protein is removed by dilute alkali; (2) pickling waste water generated during hydrochloric acid decalcification process; (3) washing waste water generated when washing crude products. [0003] Wastewater contains a large amount of protein, fat, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/14C02F11/12C05F7/00
CPCY02A40/20Y02W30/40
Inventor 张建鹏钟丽云杨晓玲
Owner SHANGHAI WENDING WATER TREATMENT ENG
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